Signal lantern



FIG. 1 is a front elevational view of a signal lantern showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is an top plan view thereof;

FIG. 6 is an underneath plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is a a left side elevational view showing alternative positions thereof;

FIG. 9 is a front elevational sectional view showing alternative positions of parts thereof; and

FIG. 10 is a front elevational sectional view showing further alternative positions of parts. 

The ornamental design for a "Signal Lantern", as shown and described. 